If you're using Internet Explorer, there's a setting that can affect Remember The Milk's ability to operate.

Go to Tools | Internet Options, click on the "Advanced" tab, and make sure "Enable native XMLHTTP support" is checked.

Check third-party software.

If the problem continues, it may be related to third-party software. Various firewall, pop-up blocking and ad blocking software, and browser plug-ins can interfere with your use of Remember The Milk.

If you use such software, we suggest adding 'rememberthemilk.com' as an exception to any ad blocking, script blocking, or pop-up blocking rules. If this doesn't help, we recommend disabling the software, clearing your cache, and logging in to Remember The Milk again.